Virtuozzo is a zetaclear oral solution
proprietary operating system-level virtualization product produced by Parallels, Inc. Both windows and Linux. Parallels Virtuozzo Containers creates multiple, isolated containers (otherwise known as virtual environments (VEs), or Virtual Private Servers (VPSs)) on a single physical server. Parallels Virtuozzo Containers virtualizes at the operating system level, rather than the hardware level as other Virtual Machine (VM) products frequently do. This allows the sharing of hardware, systems management effort, and sometimes software licenses among different workloads. A container behaves in most respects as if it were a stand-alone server.

Parallels Virtuozzo Containers was designed to be a low-overhead, fast-performing solution with many tools for simple management, since its early adopters include service providers with thousands of containers to manage. The technology is based on a single OS flavor for a server, which means that a Windows server can only host Windows containers and that a Linux servers can only host Linux containers.